Roof truss



Aug. 28, 1923. I 1,466,174

v M. KORN ROOF TRUSS Filed March 16. I920 5 Sheets-Sheet 1 Aug.28,1923. 66174 M. KORN ROOF TRUSS Filed March 16. 1920 a Sheets-Sheet 2 1,466J TM Aug. 28, 1923.

M. KORN ROOF TRUSS Filed March 16. 1920 3 Sheets-Sheet 5 joints o r' panel points l what I now consider'preferred forms of my Patented Aug. 28, 1923..

MAXIMILIAN KOR-N', Oli TEANECK, NEW JERSEY.

'ROOF TBU'SS.

Application filed March 16, 1920. Serial No. 366,218. i

T 0 all whom it may concern Be it known that I. lvlnxninnnin Kenn,

being a citizen of the United States, resid ing; at Teaneclr, in the county oi. Bergen and State of New Jersey, have invented certain new and useful improvements in Boot Trusses, of whie-h the following; is full, clear, and exact description.

This invention relates to root trusses and has for one of its principal objects to provide a root truss in which the compression members are of reinto'rced concrete and. the tension member-sot steel or other suitable metal. V

Another object is to provide a roof truss which is fire-resisting to a higher degree than the steel trusses now in use, easy to fabricate and assemble and of comparative low cost. I v

A further object is to provide improved above mentioned type. l Otlier objects and advantages will become apparent as the in.

vention is hereinafter disclosed. 4

Referring to the drawlng's which lllustrate invention: 1

Fig. 1 is an elevation of a form of roof truss, known as the combined link and fan truss, embodying my invention. 7 Fig. 1 shows the remaining portion of the truss shown in Fig. 1. l Fig'. 1? is a detail elevation: partly, in section of a part of] the structure shown in.

Fig. 1. I Fig. 2 is a detail elevation showing a modification.

Fig. 3 is a detail elevationlooking the direction of the arrow Ain Fig. 2., I

I Figs. 4 and 5 are views similar to Fig.2

but illustrating further modifications.

Referring to Fig. 1 it will be. seen that the truss there shown comprises compression members-designated 1 to 12 inclusive and tension members designatedl to 26 inclu-- sive. The compression members each consist of concrete reinforced bv means of steel. rods 27. It will be obviousthat other-forms of reinforcing means mav be employed. some of which will hereinatterbe specifically disclosed. The reinforced concrete compression members are interconnected and tied together at their points of meeting or intersection by passing the rods 27 of one member into another member which it meets or intersects, as clearly shown in Fig. 1. p

for trusses of the.

The tension members l3 to 26 are shown I in Fig. l as consisting. ot steel rodswith threaded ends. In order to interconnect the members 5,13, 14: and 25 at their point'o'f intersection a plate- 28 shown in the form otaz may be provided, said plate. being suitably drilled, or punchech'to allow the passage therethrough of the tension rods and so. arranged as .to provide the desired bearing surface for. the end of the, com'pression member 5. The threaded ends o't-the tension members 13, 14 and 25 are provided with nuts 29 which bear against theplate 28 in order to transfer the individual stresses of the various members tothe otherniem 'bers at this joint. Similar; means are provided at the following intersections 146 p as-15, 24. 8, 22+23, 9419-21, 1 9- 10 1116'15,and 12--1 6 171-18;

An L-shaped plate 30 is provided at the intersection of themembe'rs landlg. ,This plate 30 serves asa seat for the lower. endof thecornpres'sion member? 1 but also forms the connection plate; between the truss and its supporting structure such as-a column Orwall, etc. ,The threaded end of; the member 13 is shown provided with a nut 31;

adapted to seat, against. the. plate 30;

similarfjoint is effected at theintersection of the members 2 and 17.

. The. ends of the tension members 18, 20,

22.24 and 25 opposite the threaded ends are embedded in the corresponding. compressing members to a distance sufiicient to permit them properly to' transierjtheir stresses (seeFigi, 1). Thisis; also true of both ends ofthe member'fl26l Those of the v tension ,members. which pass .at f their threadedends through compression mem bers are longitudinally slidable. withirespect to the latter... Thismavbe efiectedby pass} ing. the threaded ends. through"a'. pipe or tube, section provided in the. compression members. Thusin Fig. 1 ITXELVG shown a section through the joint 1-13. The tube 32 is embedded in the concrete ofthe member 1 and the tension member '13 passes thererhrough. By virtue of this construction the tension members may be caused to'assume their correct computed lengths between joint centers by simply tightening or loosening the nuts 29 and 31 after the concrete ompression members have been cast and hardened.

At the points where the tension members are anchored in the compression members,

her

as for example where the member enters the member 1 and at any other desired points, the compression members may be reinforoed against bending and shearing by means of transverse steel bands or hoops The roofing material 36 may be supported by means of suitable purlins 37 supporter by the roof trusses.

A modified panel point connection is illus- .trated in Figs. 2 and 3. The compression member 5 and tension members 13 14 and 25 will be recognized in view otthe description ofjliig, 1'." Fig 2 the endsof the tension members 1? 1 l and 25" are provided with forged loops (instead of threads-and nuts) through which a pin 40,

carried by the, compression member 5, passes. The said pin 1-0 is shown carried by two plates 41, 42 which, together with the channel member43 secured thereto, form a seat for the end of the compression menu- A bolt 44 is passed through the plates 41, 42, embeddedin member 5 securely anchored in the latter by means of light wire mesh 45 which, extends around the said bolt andupinto theconcrete o'fthe said'member 5. V

The tension members may assume other forms. Thusfinstead of' steel rods, wire 1 cable may be employed to form thetension members as illustrated in Fig. {l5 A. further modification, in the means for connecting the tension members and compression mem: bersis illustrated in 5 in .which the memb 3, 1 and 2 l g e be recognized. this form of the invention anangle plate forms a seat for the com:

. pression member 5 and is riveted or otherthrough the plate 52 wise secured to a plate 52. f'lhe tension member 25 passes through the angle .50,

. member 5 and plate 52 and is provided with a nut 51 for transmitting the load thereto. The tension members 13 and 14 pass and are provided with nuts 5 3. V r l noted that my improved roo'f'truss'is much more resistant 'tofirethan all metal trusses.

Theprin 'paljcau e o ri ee lur offstructural steel trussesln case of fire s that the unprotected steel compression mem belts warp andfbucklefiflhere is, co npai5a-,

tiyelyi"ittle likelihood ot destruc ion i tension members 1 Among other advantages it should be signature.

Theroof truss forming the subject matter of my invention is also cheaper to construct than all steel trusses. Reinforced concrete is practically the cheapest material for carrying compressive stresses.

nated. The concrete members are also capable of withstanding attacks, of corrosive gases. V

Obviously my invention may be embodied in other forms of roof trusses than that illustrated in Fig. 1. To avoid surplusage I have omitted further illustration.

VVhatI claim is: 3 V A roof truss comprising in combination, a plurality of compression members of coin crete reinforced by longitudinally extending steel rods, and tension members consisting substantially entirely of steel. rods, means comprising Z-shaped plates forming a seat for certain of said compressionmem 'bers and to which certain of said tension members are adjustably connected; at one end, the opposite ends of the last named ten sion members being embedded in the concrete of certain others of said compression 'members, a plurality o f steel hoops embed ded in the concreteof certain ofsaid'co mpres'sion members andsurrounding the re; inforcing rods of said compression members and the ends of certain of said tension members, Ei-shaped bearing plates connected to theoppositeends of saidtruss and through which horizontal. tensionmembers extend,

and a plurality ofroof-supporting purlins carried by said truss. V p

- In'testimony whereof I hereunto aiiix my M X MILIAN Kata;

The truss area .requiringpainting is greatly reduced andmay even "be elimi- 

